| Mechanical Engineering | Engineering & Materials |
Q: What is Pascal's principle, and what does each letter in the equation represent?
A: Pascal's law, or principle, states that fluids transmit pressures equally in all directions.
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| Anthropology & Archeology |
Q: How do we know that certain proto-humans belong to a different species? Why are they considered a separate species instead of possible rare cases?
A: Species are the basic unit of evolution, but our definition is usually based on living animals. When dealing with fossils, scientists compare the differences between a new form and a known species with those among two or more closely related species; if the new form is "different enough" it may be named as a new species.
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| Bioscience |
Q: What is the difference between the lung of someone who has asthma and the lung of someone who doesn't?
A: There are two important differences between asthmatic lungs and nonasthmatic lungs. First, the small tubes (bronchioles) of the asthmatic lung are prone to becoming inflamed, that is, swollen, irritated, and lined with extra mucus. Second, these tubes vary in sensitivity.
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